Switch Uplink - Undersize Packets

I have a 3750 switchport connected to a 3845 router. I am seeing a high number of "UnderSize" packets when I issue a "show interface counters errors" command. I have hardset the interfaces to Full/1000, but this has not helped. Any help would greatly be appeciated.

I saw the same during a tech refresh. We replaced 2600 routers with 3700/3800 routers and I immediately noticed the undersized frame counters incrementing on the switch interfaces, but not on the router interfaces. We captured data and saw there were really no undersized frames being transmitted. I opened a TAC case and this is what I was told: "Your issue is purely cosmetic issue and does not have any performance issues and also does not explicitly requires IOS upgrade.. Please co-ordinate with the NCE for IOS upgrade."

I with you. I really dislike the "ignore it, it's only a cosmetic bug" answer. Pay no attention to the man behind the curtain.. I argued with the TAC engineer for a while via email, but he finally just said to upgrade IOS on the 3750's. Which we did (and no easy feat at that - 1900 3750's on our network). We're running 12.2(25)SEE2 now and still seeing the errors increment. We don't plan to upgrade the 3750's again until Cisco works out some of the stacking issues. I'm curious to see if someone from Cisco will have any input on this. Will keep an eye on this conversation. Thanks, and good luck.